Steam-boiler setting.



No. 723,860. PATENTBD MAR. 31, 1903. E. GIBSON.

STEAM BOILER SETTING.

APPLICATION FILED APR. 19. 1902.

no MODEL. 2 SHEETS-SHEET 1.

WITNESSES: !NVENTOR PATENTED MAR. 31, 1903.

3. GIBSON. v STEAM BOILER SETTING. APPLICATION FILED APR. 19, 1902.

2 SHEETS-SHEET 2.

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THE NORRIS wzrznsco, Pumoumo" Wsammcm o. c.

UNITED STATES PATENT OFFICE.

EDWARD GIBSON, OF JERSEY CITY, NEW JERSEY.

STEAM-BOILER SETTING.

SPECIFICATION forming part of Letters Patent N 0. 723,860, dated March 31, 1903.

Application filed April 19, 1902. Serial No. 103.794. (No model.)

To all whom it may concern:

Beit known that I, EDWARD GIBSON, a citizen of the United States, residing in Jersey City, in the county of Hudson, in the State of New Jersey, have invented a certain new and useful Improvement in Steam-Boiler Settings, of whichthe following isa specification.

It has long been common to complete the combustion of the gaseous products rising from the coal in a steam-boiler furnace by sup:

plying fresh air in small jets thereto and also to supply air for such purpose by the force of steam-jets. Steam properly conditioned is not wet, and it is found to be no injury, but rather an advantage, to have the steam mingled with the air before it is projected into the current of gases. tant improvements in the apparatus for attaining these ends.

I provide boxes, which I will term shells/i of cast -iron or equivalent strong material which is a good conductor of heat, and mount such immediately in the rear of What is technically known as the bridge-wall. vide such cases with perforations distributed so as to eject jets of air in any required direction, usually upward and also both forward and backward, and I provide passages in the walls of the furnace through which mingled air and steam are brought upward from the ash-pit and delivered into such boxes, one such air-passage being provided on each side.

I blow the air and steam into the ash-pit bythe force of powerful steam-jets delivered from pipes subjected to the full pressure of the steam in the boiler. I superheat the steam, abstracting heat therefor from the gases after they have passed the bridge-wall and have imparted so much of their heat to the boiler that they are considerably lowered in temperature, but are still hot enough to serve usefullyin not only thoroughly drying butsuperheatingthe steam. There is a'refrigcrating eifect produced on the gases by the presence of the superheatingpipes. The fact that they are located in rear of the bridgewall insures that such has no influence on the heat of the furnace, which is the main steam-generating agency; but it is important to preserve the heat of the gasesfor .a considerable distance after they have passed the wallin fact, till they part company with I have devisedimpon' I pro- .tute the top of the fire-bridge.

the boiler. I provide for defending the gases against being too much cooled by the pres ence of the superheating-pipes along the side walls. conditions for the pipes to become too highly There is also a liability under some heated: This is most likely to occur when 1 the fire is very hot and the steam is for some consider the best means of carrying out the invention.

The accompanying drawings form a part of this specification.

Figure 1 is a longitudinal vertical section on the line 1 1 in Fig. 2. Fig. 2 is a duplicate figure, the left side being a vertical cross-section on the line 2 2 in Fig. 1 and the right half being a section on the line 2 2 in Fig. 1. Fig. 3 is a front view of the boxes which consti- Figs. stand 5 are on a larger scale. Fig. 4 is a face view of one of the tiles, seen. from'the interior of the secondary combustion-chamber. Fig. 5 is a vertical section on the line 5 5 in Fig. 4.

Similar letters of reference indicate corresponding parts inall the figures Where they appear. 7

A indicates the boiler; A,the ordinary lugs riveted on the sides to aid in supporting it on the side walls; M M, the walls, and m the lines or short inclined channels in the walls which convey the mixture of steam and air upward from the ash-pit and obliquely backward to pour them into the shells.

O is the grate, and L the lower and main portion of the fire-bridge, and a the secondary combustion-chamber.

It will be understood that all the parts not particularly referred to may be of any ordinary or suitable construction.

E indicates the shells, and "e the perfora- ICC tions therein through which the fresh air mixed with steam and ata high temperature is discharged into the gases to complete the oxidation or burning ofany combustible matter therein.

B is a small steam-pipe leading from the dome of the boiler. This extends downward 10 a point inside of the wall M in rear of the bridge-wall, where it forms aseries of returns,(indicated by 13'.) From the lower end of these returns the pipe extends forward, as indicated by B and brings the steam highly heated to a tapering spiral or snail-formed coil 13, mounted in a suitable aperture in the wall communicating with the ash-pit. This pipe may be made in any number of lengths coupled together and supplied with one or more controlling cocks or valves B N is a channel-iron built into the wall M, extending along directly over the returns B, one edge projecting inward and upward, as shown in Figs. 2 and 5.

M indicates bricks set in the wall projecting therefrom into the secondary combustionchamber a below the lowest of the superheating return pipes. Another row of bricks (marked M are set immediately below M and projecting farther from the wall,as shown in Fig. 5. v

P is one of a series of specially-formed shields made of fire-clay. Each has perforations 19, and each is provided with a hook P, by which it can be hung upon the projecting edge of the channel-iron N. The depth of these shields is such as to nearly but not quite extend down to the series of bricks M In other words, the lower edges of the shields rest in the rabbet formed by the bricks M M These shields, by the, aid of the channel-iron N above and bricks M M below, inclose the returns B. They may be hung on the iron with a little space between them, so that while the tiles shield the superheating-pipes from ever becoming very intensely heated they are certain to be kept at a moderately high temperature and able to properly superheat the steam flowing through them whenever the furnace is operating. The heat in the gases traversing rearward through the main body of the secondary combustionchamber a raises the temperature of the pipes B by the conduction of the heat through the material of the shields P and also by radiating through the perforations p and more or less through the vertical joints, the vertical edges where the several shields form a series applied approximately but not tightly against each other.

When the apparatus is in operation, steam flows from the boiler through the pipe 13, returns ]3', extension B and snail B escap ing in fine strong jets from the latter and drawing in fresh air, raising the pressure in the ash-pit. Much of the air and steam goes upward through the grate O and blows the fire in the ordinary manner. Another portion of such air and steam, that with which this invention deals, rises through the inclined passages m on each side and entering the shells E blows out in gentle jets through the perforations e in the latter and induces complete combustion of the gases flowing away of steam, and in addition heats the returnbends B through the interposed shields and induces a superheated condition of the steam, which contributes to the heat in the ash-pit and furnace.

The material of the snail B and of the perforated cap thereon should be copper. The shells or bridge-wall caps E should be of castiron.

Modifications may be made without departing from the principle or sacrificing the advantages of the invention. I have shown the superheating-pipes and the shields on one side-theleft sideonly. A corresponding set of apparatus may be mounted on the opposite side, I have shown the inclined passages m on each side of the furnace, bringing the hot air and steam under gentle pressure upward and pouring them in at each side of the fire-bridge, and such construction allows the shells to be made in two separate castings mounted independently and to have their inner ends closed; but by making the shells all in one or by making two or more and having the passagesopen across the whole breadth I can make the invention serve usefully with only one passage m that is to say, with only the inclined flue 77?. shown on the right-hand side or the left withoutthe other.

Some of the advantages due to certain features of the invention may be separately enumerated as follows: First, by reason of the furnace having a steam-blower B and the fact that the secondary combustion-chamber, by which I include all the horizontal passage a in rear of the fire-bridge, is of such depth as will allow of contraction laterally, and of the series of return-pipes B, arranged within such passage at one side, with a suitable con nection B for receiving steam from the boiler and a suitable extension B for conveying the steam therefrom to the blower, I am able to temper the effect of the gases and insure a moderately high degree of superheating un der all conditions and to attain such end without in any wise cooling the wall M in front, of the fire-bridge, so as to diminish the effect of the fire in that important part of its steam-generating work; second, by reason of the furnace having a steam-blower B and of the series of return-pipes B, arranged within the secondary combustion-chamber a at one side, with a suitable connection B for receiving steam from the boiler and a suitable extension 13 for conveying the steam therefrom to the blower, and of the employment therewith of the series of perforated ICO shields P P, of fire-brick, extending nearly continuously between such returns and the current of variably hot gases traversing the remainder of the connection, I am able to still more evenly temper the effect of the gases and insure a moderately high degree of superheating under all conditions and to attain such end without in any wise cooling the Wall M in front of the fire-bridge, so as to diminish the efiect of the fire in that important part of its steam generating work; third, by reason of the further fact that the channel-iron N is permanently set'in the Wall M in rear of the fire=bridge, with its flange presented upward, and of the manufacture of the shields P, each separately provided with a hook P, formed integral therewith, I am able to easily and rapidly apply and remove the shields and to change the width and the distribution of the spaces between them to' attain the best conditions with various fuels; fourth, by reason of the further fact that the passages m are recessed into the side walls M in front of the fire-bridge andinclined, as shown, and that the shells E e are of metal, which conducts the heat rapidly, and that they open laterally, so as to freely receive and distribute along its whole breadth the air mixture to be discharged through such passages, I am able to heat the jets of air and steam and to promote the burning of the combustible matter in the gases without obstructing or in any way interfering with the usual flow of the gases from the furnace to and over the fire-bridge.

I claim as my invention-- 1. In a steam-boiler furnace, the combination of a bridge wall dividing the furnace into a primary combustion -chamber and a secondary combustion-chamber, a series of returns B arranged in the secondary combustion-chamber and constituting a superheater and connections between the boiler, the returns and the blower, whereby steam superheated by the gases after they have passed the bridge-wall is supplied to the blower, substantially as specified. 2. In a steam-boiler furnace, the combination of a bridge-wall dividing the furnace into a primary combustion-chamber and a secondary combustion-chamber, with shielding devices P of fire-brick material arranged at the side, a series of returns B arranged in the secondary combustion-chamber between such shields and the side wall, and constituting a superheater and connections between the boiler, the returns and the blower, whereby steam superheated by the gases after they have passed the bridge-wall is supplied to the blower, substantially as described.

3. In a steam-boiler furnace having a secondary combustion-chamber o. with a boiler A and steam-blower B in combination with the returns B in the connection between them, arranged as shown with the iron N, per manently set in the wall M in rear of the firebridge, and the series of perforated shields P having hooks P made integral therewith,

adapted to match on such iron, all arranged to serve substantially as herein specified.

4. In a steam-boiler furnace, the Walls M having passages m recessed therein extending forward and rearward of the fire-bridge, and the metal shells E extending along the top of the fire-bridge and connecting with such passages at the sides, such shells being provided with apertures 6 adapted to discharge into the gaseous products of combus tion, combined and arranged to serve substantially as herein specified.

In testimony that I claim the invention above set forth I affix my signature in presence of two witnesses.

EDWARD GIBSON.

Witnesses:

J. B. OLAUTIcE, M. F. BOYLE. 

